On Wed, May 28, 2014 at 5:38 PM, Oleg Eterevsky <[email protected]> wrote:
> 3. It seems like almost any string operation requires as_slice().
> Can't various string methods be also implemented for String?
>
When writing functions for others to use, you don't want to require them to
have a String, since that requires a heap allocation. It's free to go from
String to a slice, but not vice-versa. That said, there's been whispers of
making String implement Deref, as well passing as arguments to autoderef,
so you could pass a String and rustc would convert to a slice for you.
> 5. Simple indexing doesn't work for vectors:
> let a = vec![1, 2, 3];
> println!("{}", a[0]);
> It's a bit surprising...
>
Known issue: https://github.com/mozilla/rust/issues/11875
>
> 6. impl ToStr for custom struct fails:
> error: conflicting implementations for trait `std::to_str::ToStr`
> note: conflicting implementation in crate `std`
> Is it a bug? Is Show implicitly assumed for all struct's?
>
This is because ToStr is implemented for all Show implementations. You
can't implement ToStr, because if you then implemented Show, you'd have
conflicting implementations. #[deriving(Show)] on your structs is probably
all you want.
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